Boiler and furnace.



. f PATENTED MARfZO; 1906. E. BORRITT. BOILER AND FURNACE.

APPLICATION FILED AUG. 12. 1905. I

I z SHEETS-SHEET, 1.

'WITNESSES alum/ Tog v ATTORNEYS No. 815,636. PATENTED MAR. 20, 1906.

I E. PORRITT. BOILER AND FURNACE.

APPLICATION FILED AUG.121 1905.

2 SHEETS-SHEET 2.

WITNESSES /Nl/ENTOR I I By zdw Pom-1f A T 70mm;

j to my invention; Fig. 2, asection on'the line readily accessible for EDWIN PORRITT, OF NEW YORK, N. Y.

PATENT OFFICE.

BOILER AND FURNACE.

Specification of Letters Patent.

Patented March2 0, 1906.

Application filed August 12, 1905. Serial No- 273,883.

To all whom it may concern.-

Be it known that I, EDWIN PORRITT, a citizen of the United'States, residingv at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Boilers and Furnaces, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same. p

The object of this invention is to providea new and improved steam boiler or generator, preferably of the water-tube type, wherein the grate area of the furnace may be varied at will a further object being to provide a boiler .or steam-generator, preferably of the watertube type, wherein the area of the watertubes subjected to direct heat may be varied at will, and a still further object being to provide a boiler or steam-generator of the typev specified wherein the grate bars are made substitution or repair and-in which the said bars may be agitated or reversed in their entirety or in part from without, if desired and with these and other objects in view the invention consists in ,a boiler orsteam generator constructed as hereinafterdescribed and claimed.

The invention is fully disclosed in the following specification, of which the accompanymg drawings form' apart, in which the separate parts of my improvement are des- :1gnated by suitable'reference character'sv in each of the views, and in which Figure 1 is a longitudinal vertical section taken through a boiler constructed according 2 2 of Fig. 1; Fig. 3, a section on theline 3 3 of Fig. 1, and Fig. 4 a fragmentary view'of a portion of thegrate-bars. 7

In the drawings forming part of this specie fication I have shown a boiler and furnace provided with a fi'ont' plate a, a back plate I),

' and a jacket 0, connecting the same, and the I door a upon which is a and sald front acket 0 is provided with a flue cl, in which is mounted a damper e. The front a is provided, as shown in Fig. .1, with an ash-pit mounted a draft-door is also provided with a. firing-door or, while the back plate?) is provided and the jacket 0 with doors c ounted at each curedto the front and rear members thereof, as clearly shown in Fig. 1, are two casings f, which are in communication with eachother abovethe water-level of vwhichis mounted a bar W, Y shaped on its upper surface, and the bars k c ed with a rod m,

other by means of a steam-pipe h, arranged the boiler, and said steam-pipe h is provided with a valve 72 anda safety device if and is preferably arranged within the jacket 0, as clearly shown, and one of the casings f is provided with an inlet '5, and the other casing-f is provided with an outlet 01 by means of which water may be admitted and removed from the said and from the water-tubes 9.

At t I have shown a water-gage and at i a steam-gage, which are connected with the pipe h by vmeans mounted a diaphragm 7, provided with'an arm U, to the one endof which is secured a chain i the lower end; of which is connected with the draft-door a and the damper e may also be connected with the diaphragm t, if desired, this, however, not being shown in the drawings, as it forms no part of this invention. i

Slidably mounted on the water-tubes g and on the p'ipeh is a partition 9 which may be moved backwardly or forwardly thereon either from the doors 0 or from the door 6 and when the partition 9 is moved forwardly the area of the water-tubes 9 being subjected to' direct heat is reduced, as will be seen, and when the partition 9 is moved backwardly thedirect heating area of the water-tube g is Increased. I Arranged oneither side of the boiler or in the furnace portion thereof beneath the water-tubes g are supports 7c, upon each of which is wedgeext'endthe full length of the furnace and are slidable upon the supports it, as will be readily seen by reference 'to'Figs.

drawlngs,, and the bars 70' are also provided by meansof the usual water-tubes g, and the, tops of the'caslngs f are connected with each casings of a pipe '5 in which is' 2 and 3 of the with a plurality of recesses E, which are adapted to. receive the ends of grate-bars m of any preferred construction, the ends, however, of the grate-bars m being circular in cross-section to p'ermit'of movement-in the recesses k j The grate-bars m are provided with downwardlydirected lugs m and'the lugs m of-a predetermined number are connected at one ,end of said bars by means of links m which are inturn connectwhich' is pivotally connected with alarm m mounted on a shaft m,

and rotatable thereon, and the arm m is proof the said 'grate:bars 1 i IIO vided with a bar m outside of the boiler, and it will be seen that when the bar m is moved a portion of the grate-bars m is agitated or reversed and the fuel thereon is shaken or dumped, as will be understood. The remaining grate bars m are connected in a similar manner at the opposite ends thereof with links a, which are in operative connection with an arm n secured to the shaft m, and the shaft m is provided with a bar a at the outer end thereof, by means of which the grate-bars m, connected by means of the links a, may be agitated or dumped, and the connection of the links a with the arm n is detachably made by means of a band a, held in place thereon by means of a pin a. This construction is also applicable to the connection of the rod m with the arm m and the reason for it will be hereinafter described.

Slidably mounted on the wedgeshaped tops of the bars k is a plate 0, provided with an upwardly-directed member 0 and upon the plate 0 are placed the usual fire-brick 0 and the usual bridge is formed thereby, and to the rear of the plate 0 is pivoted a rod 0 which is in turn pivoted to an arm 0, secured to a transverse shaft 0, passing through the furnace and beneath the grate-b ars thereof, and the shaft 0 is provided with a bar 0 outside of the boiler and by means of which it may be operated, and when the bar 0 is moved backwardly or forwardly the bridge 0 is moved correspondingly, and the grate area is increased or decreased correspondingly. Pivotally connected with each side of the plate 0 at the rearward end thereof are dogs 0 which are adapted in their lowermost position to be engaged by the recesses k of the slide-bars W, and the normal position of the dogs 0 is that shown in full lines in Fig. 1.

If it is desired to remove one of the gratebars m for substitution or repair or access thereto is desired for any reason, all that is necessary is to open the ash-pit door c disconnect the grate-bars or their connections from the arms m and M, and then by means of the bar 0 move the bridge 0 to its extreme backward position, at which time the dogs 0 are dropped into the corresponding recesses k and when the bar 0 is drawn forwardly the slide-bars k are forced out of the furnace a distance equal to the movement of the bridge 0, and if it is desired to draw the grate-bars out a still further distance the same may be done manually, and any one of the grate-bars m may then be removed or said bars may readily.

After the repairs to or scraping of the grate-bars on have been attended to the slidebars k are forced to their innermost position,

' as shown in Fig. 1, and the grate-bars m are then in readiness for use and are again connected w1th the arms m and M, as previously described.

be chipped or scraped veryv By means of this construction it will be seen that the grate area may be varied at will, as may also the area subjected. to direct heat of the water-tubes g, and fire of sufficient proportions may be built to suit the requirements of the weather if my invention is used as a heating-furnace or to generate a given amount of steam-pressure if it is used for any other purpose, and a great economy of fuel results from this construction, not alone because of the reduced grate area, but because of the rapidity with which steam is generated in my boiler.

In practice I prefer to form the upper portions of the casings f into enlarged steamdrums, which are subjected to a portion of the heat, as is also the pipe h, and the steam therein is thereby superheated, and the heat from the furnace flows upwardly in the direction of the arrow 90 until it reaches the acket c, at which time it is deflected in the direetion of the arrow 00 and around the bottom of the plate 9 as shown at so, and thence upwardly through the flue (Z. In this manner the portion of the water-tubes g over the available grate-surface is subject to direct heat, the rearward portion thereof in front of the plate g to indirect heat, as is also that portion of the water-tubes to the rear of the plate g It will be seen that both the steam-drums and the steam-pipe 71 as well as the watertubes, are subjected to some heat for their entire length, and this heat or the degree thereof is variable according to the grate area.

By dividing the grate-bars into separate sets, as herein described, and providing means for agitating and operating each set separately it will be seen that the bridge may be adjusted for the use of the front set of gratebars only or for the use of both sets of gratebars or for the use of the front set and a part of the rear set. It will also be seen that by means of my invention ready access to the grate-bars is obtained, and the same may be readily removed from the furnace and replaced, and it will be obvious that the details of the construction shown and described may be modified within the scope of this application, as various changes in and modifications of the said construction maybe made without departing from the spirit of this invention or sacrificing its advantages, and, with this reservation,

What I claim as new, and desire to secure by Letters Patent, is

1. In a steam-generating apparatus, a furnace-casing having a front door, side bars movable longitudinally in the opposite sides of the furnace-casing and outwardly through the front door, grate-bars mounted loosely between said side bars and pivotally supported thereby and detachable therefrom and divided into separate sets, one set of said grate-bars being detachably connected with side longitudinally-arranged link members, and

7 longitudinally-movable bridge mounted 011' ed thereby and detachable the side bars, and means for moving said bridge longitudinally of said bars over the grate-bars, substantially as shown and described. v

2; In a steam-generating apparatus, a furnacecasing having a front door, side bars movable longitudinally in the opposite sides of the furnace-oasingand outwardly through the front door, grate-bars mounted loosely between said side bars and pivotally supporttherefrom and divided into separate sets, one set of said gratebars being detachably connected with lon itudinally-arranged link members, and t e other set of said bars being alsodetachably' connected with other longitudinally-arranged link members, devices on the outer side of the furnace-casing in o erative connection with said link members or operating the separate sets of grate-bars separately, a longitudinally-movable bridge mounted on the side bars, and means, for moving said bridge longitudinally of said bars over the grate-bars, and for locking the same in any desired position, substantially as shown and described.

' 3. In asteam-generating apparatus, a furnace-casing provided with longitudinally-arranged side bars movable outwardly through a front door, a plurality of grate-bars divided into sets and pivotally supported, between said side bars and detachable therefrom, each set of'said grate-bars being connected with l nk members, devices mounted on the outer side of the furnace-casing and in operative connection with the separate link members for agitating the separate sets of grate-bars separately, a bridge movable over said side bars and grate-bars longitudinally of the furnace-cas ng, means for'moving said bridge, and devices for locking said bridge in the desired position, substantially as shown and described.

4. In a steam-generating apparatus, a furnace-casing provided with longitudinally-arranged side bars movable outwardly through a front door', a plurality of grate-bars divided into sets and pivotally supported between said side bars and detachable therefrom, each set of said grate-bars being connected with link members, devices mounted on the outer side of the furnace-casing and in operative connection with the separate'link members for agitating the separate sets of grate-bars separately, a bridge movable over said side bars and nace casing, means for moving said bridge, and devices for locking said bridge in the desired position, said furnaoe-casin being also provided in the opposite sides t ereof with doors and with a transverse partition movable longitudinally of said casing, substantially as shown and describe In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 11th day of August, 1905.

EDWIN PORRITT. Witnesses: 'f'

C. E; MULREANY, F. A. STEWART.

grate-bars longitudinally of the fur- 

